Theybuiltahighway_______themountains.
A、leadintoD
leading into 的逻辑主语是 highway ，它们之间是主动的关系，所以用动名词形式。句意：他们修建了一条通往山里的公路
Sofarscientistshaveonlyacquired________understandingofthephysicalprocessesthatcauseearthquakes.
Importswillbeallowedinproportion_______exports.
Thechallengeisnotoneofexpansion._______,therapidgrowthinenrollmentoverthelast40yearshascometoanend.
名词解释：preferredstock
名词解释：offer
